Date: Wed, 21 May 97 16:47:32 METDST From: Rob Schofield <rschof@mccomm.nl> To: freebsd-hardware@freebsd.org (Hardware list at FreeBSD) Subject: Re: isa bus and boca multiport boards Message-ID: <199705211447.QAA05321@mccomm.nl> In-Reply-To: <970521090243.22a1ce87@wofford.edu>; from "Dan Welch" at May 21, 97 9:02 am
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>
> >> > And, IRQ 12 is used for PS/2 mouse ports built into motherboards.
> >>
> >> I used the cmos setup to turn that off. Is that reliable?
> >
> > No. I've seen myself that disabling PS/2 mouse
> > in BIOS doesn't leave IRQ12 for you -- last time
> > that was on Packard Bell 486 box, with Phoenix BIOS,
> > when we tried to install second AHA-1542 in it.
> >
> > Despite of disabling PS/2 in BIOS, 1542 did all kinds
> > of strange and mysterious things ("going to polling
> > mode", loosing interrupts, etc.) until we moved it
> > from IRQ12 to some other one.
>
> Just as I feared ... thanks for sharing your experience.
>
Errr... I hate to say this, but isn't this just a teensy-weensy bit
subjective? *One* problem on *one* system means that all systems react the
same way? I have successfully operated the same ethernet and RAID
cards on interrupt 12 in three seperate systems without any trouble.
If you read the PS/2 documentation, it detaches the IRQ line from the
built in bus-mouse hardware by disabling a buffer. This is how it works
in *PS/2 SYSTEMS ONLY*. How it works in any other system is undefined
unless you contact the manufacturer and confirm it... ;^)
Rob
--
Witticisms are hard to define on Monday mornings...
schofiel@xs4all.nl http://www.xs4all.nl/~schofiel
rschof@mccomm.nl
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